"It is a love story, an emotional story and a true story," the act's members told the judges of their performance.

When they had finished, a teary Amanda Holden said: "My goodness. I actually can't speak. I found that just so emotional and touching. You just made me really think about everything. It was amazing."

Alesha Dixon responded similarly, commenting: "That was so beautiful, just so poignant and emotional. I kind of forgot that we were here and you just drew me in completely. It was fantastic. Loved it."

David Walliams added that it was "absolutely faultless", with Simon Cowell saying: "Wow. That was quite something.

"Guys, I just want to say thank you actually for coming over to enter this competition. I'm always very flattered when people from other countries want to compete on this show and it is one of the best acts I've ever seen in terms of originality and it was very touching."